ABSTRACT Magnesium hydride (MgH 2 ) has been regarded as an attractive candidate for solid‐state hydrogen storage, yet its practical applications are limited by the requirement of elevated temperatures and sluggish hydrogen uptake and release kinetics. Herein, TiO 2 polyhedral frameworks with uniformly distributed V 2 O 5 (denoted as V 2 O 5 /TiO 2 ) are constructed to improve hydrogen storage performance of Mg/MgH 2 . During the reversible hydrogenation and dehydrogenation process, metallic V and Ti along with low‐valent Ti‐ and V‐based oxides are in situ formed. Among them, metallic V supported on TiO 2 exhibits the lowest hydrogen adsorption energy, enabling superior catalytic performance over TiO 2 and V 2 O 5 . As a result, the peak dehydrogenation temperature of MgH 2 decreases to 215°C, 105°C lower than that of pristine MgH 2 , with a decrease of the apparent activation energy from 139.50 kJ·mol −1 to 68.99 kJ·mol −1 . Moreover, electron migration from V toward TiO 2 leads to charge accumulation around Ti and O atoms, shifting the V 3 d ‐band center toward the Fermi level and thereby improving the catalytic function of V's d‐electrons, facilitating hydrogen dissociation without energy barriers. Therefore, the V 2 O 5 /TiO 2 ‐catalyzed Mg absorbs 4.12 wt% H 2 under an ultralow pressure of 1 bar at 25°C. This provides a new strategy for developing advanced Ti and V‐based catalysts for mild‐condition hydrogen storage of MgH 2 .

ABSTRACT Dynamic molecular crystals represent an emerging class of adaptive smart crystalline materials, which have been found to be used as energy‐converting materials in recent years. In this perspective, we highlight several excellent examples of dynamic molecular crystals for energy conversion, involving the transformation from light energy into kinetic energy, heat energy into kinetic energy, and mechanical energy into electrical energy. Although significant progress has been made in the field of energy conversion in dynamic molecular crystals, the realization of practical applications poses challenges with precise control over molecular movements and macroscopic dynamic behaviors of molecular crystals, mechanical response speed, mechanical damage, lifetime, etc. Future research efforts should be focused on the establishment of predictive approaches toward dynamic molecular crystals as energy‐converting materials with desired dynamic properties such as controllable mechanical deformation, reversible and fast response, efficient energy conversion, low cost, and low‐to‐none fatigue in operation.

ABSTRACTIonogels have garnered significant attention in soft electronics, sensors, and biomedicine due to their combination of flexibility, thermal stability, and ionic conductivity. Nonetheless, challenges associated with designing ionogels with reliable properties for health monitoring scenarios still remain. This review offers a novel perspective on the development of wearable sensors for health monitoring by comprehensively examining ionogel synthesis methodologies, highlighting critical performance parameters, and exploring underexplored applications. First, the design principles governing polymer network optimization and advanced manufacturing techniques for ionogels are elucidated. Then, the strategies for enhancing critical performance are discussed, followed by an exploration of specific application scenarios, including noninvasive biochemical analysis, real‐time motion monitoring, and disease‐specific assessments. Finally, an outlook on future challenges and opportunities in the emerging field of ionogels is provided. The establishment of a hierarchical health monitoring framework that integrates molecular‐, individual‐, and systemic‐level perspectives offers readers a unique and in‐depth understanding, which advances the comprehension of this emerging field.

ABSTRACTMXenes, a family of emerging two‐dimensional materials offer enriched surface chemistry, high electrical conductivities, large specific surface area, intrinsic physicochemical properties, and excellent mechanical stability. However, restacking of MXene sheets limit their electrochemical performance. To overcome this limitation, recent advancements have focused on developing MXene composites with metal phosphates/phosphides (MXene/MPs). This review discusses the applications of MXene/MPs composites in energy storage and conversion applications. The incorporation of MPs into MXenes not only addresses the restacking issue and aggregation problems, but also enhances the overall electrochemical performance of energy storage and conversion systems. The review concludes with a summary of the current research status and future prospects for MXene/MPs‐based composites in energy applications.

ABSTRACTAnode‐free sodium batteries (AFSBs) have attracted increasing attention for their high energy density. However, they suffer from rapid capacity decline resulting from sodium dendrite growth at the sodium/host interface and irreversible side reactions at the electrolyte/sodium interface. Herein, a GaInSn‐coated Cu foil (G‐Cu), prepared by a simple brush coating method, was applied as the sodiophilic current collector to regulate sodium nucleation behavior. In addition, a nonexpendable functional electrolyte additive, hexamethyldisiloxane (HMDSO), was introduced, which could be absorbed on the sodium surface and serve as a protective layer against corrosion side reactions at the electrolyte/sodium interface. It is interesting to note that this additive barely participated in forming the solid electrolyte interphase. The synergetic effects of sodiophilic interface design and electrolyte regulation enable reversible sodium plating and stripping. Ultimately, the AFSB assembled using G‐Cu and HMDSO electrolyte with a highly loaded Na3V2(PO4)3 cathode (≈12.5 mg cm−2) delivers a discharge capacity of 84.5 mAh g−1 after 200 cycles with a high capacity retention of 87.6%, significantly extending its operation lifespan.

ABSTRACTMetal–air batteries are an appealing option for energy storage, boasting a high energy density and environmental sustainability. Researchers focus on the catalyst design to solve the problem of sluggish cathode reaction kinetic. However, in some cases, where thermodynamic regulation is required, the role of catalysts is limited. Based on catalysts changing reaction kinetics, external fields can change the thermodynamic parameters of the reaction, further reduce overpotential, and accelerate the reaction rate. By selecting appropriate external fields and adjusting controllable variables, greater flexibility and potential are provided for reaction control. This paper reviews the basic principles by which several external fields influence metal–air batteries. Additionally, some design strategies of photoelectrode materials, the similarities and differences of different magnetic field effects, and some research progress of the ultrasonic field, stress field, and microwave field are systematically summarized. Multifield coupling can also interact and produce additive effects. Furthermore, introducing external fields will also bring about the problem of aggravated side reactions. This paper proposes some research methods to explore the specific reaction mechanism of external field assistance in more depth. The primary objective is to furnish theoretical direction for enhancing the performance of external field‐supported metal–air batteries, thereby advancing their development.

Abstract The development of efficient and robust non‐Pt and low‐Pt catalysts with equivalent or even superior performance to commercial Pt‐based catalysts for hydrogen evolution reaction (HER) is highly desired, but challenging, in the field of water electrolysis. Herein, we report a facile and cost‐effective in situ electrochemical approach for the synthesis of atomically dispersed metal sites including platinum (Pt), ruthenium (Ru), and palladium (Pd) on the polyaniline (PANI) support. The PANI exhibits not only high electrochemical conductivity but also efficient H+ capture from hydronium ions, leading to the formation of protonated amine groups that can be easily electrochemically reduced to H2 on atomically dispersed metal active sites. As an example, the atomically dispersed Pt sites anchored on carbon cloth‐supported PANI (PANI‐Pt/CC) demonstrate excellent activity and durability toward the HER. The mass activity of PANI‐Pt‐10/CC reaches 25 A mgPt−1, exhibiting a significant enhancement of 50‐fold compared to that of the commercial Pt/C (0.5 A mgPt−1). Therefore, this study presents a universally applicable approach for the design of atomically dispersed metal sites/conducting polymer heterostructures for highly efficient catalysts toward HER and beyond.